function popup (url) { // (C) Steinbock-Ferienwohnungen //
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    fenster.document.write("<html><head><title>Usedom-Fotokalender: Jeder Tag ein Erlebnis.</title>");
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    fenster.document.write("<h1>1usedom.de: Die Ostseeinsel Usedom an jedem Tag genie&szlig;en.</h1>");
    fenster.document.write("<img src='" + url + "' style='border: 1px solid black;width:480px;height:360px;'>");
    fenster.document.write("<p>&#9658; Wundervolle Impressionen an jedem Tag.; &copy; Steinbock-Ferienwohnungen, Usedom.</p></td></tr><tr>");
    fenster.document.write("<img src='usedom_bilder/steinbock-logo.gif' style='position:absolute;bottom:34px;right:26px;'>");
    fenster.document.write("<td><input type='button' value='Fenster schlie&szlig;en' onClick='self.close()'>");
    fenster.document.write("</td></tr></table>");
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